[PATCH 5.10 393/406] net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add

Greg Kroah-Hartman
2023-09-17T19:43:56Z

From: Guangguan Wang <guangguan.wang@linux.alibaba.com>

[ Upstream commit f5146e3ef0a9eea405874b36178c19a4863b8989 ]

While doing smcr_port_add, there maybe linkgroup add into or delete
from smc_lgr_list.list at the same time, which may result kernel crash.
So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
smcr_port_add.

The crash calltrace show below:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014
Workqueue: events smc_ib_port_event_work [smc]
RIP: 0010:smcr_port_add+0xa6/0xf0 [smc]
RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297
RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918
R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4
R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08
FS: 0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0
PKRU: 55555554
Call Trace:
smc_ib_port_event_work+0x18f/0x380 [smc]
process_one_work+0x19b/0x340
worker_thread+0x30/0x370
? process_one_work+0x340/0x340
kthread+0x114/0x130
? __kthread_cancel_work+0x50/0x50
ret_from_fork+0x1f/0x30

Fixes: 1f90a05d9ff9 ("net/smc: add smcr_port_add() and smcr_link_up() processing")
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/smc/smc_core.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index e84241ff4ac4f..ab9ecdd1af0ac 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1101,6 +1101,7 @@ void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
{
struct smc_link_group *lgr, *n;

+ spin_lock_bh(&smc_lgr_list.lock);
list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
struct smc_link *link;

@@ -1115,6 +1116,7 @@ void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
if (link)
smc_llc_add_link_local(link);
}
+ spin_unlock_bh(&smc_lgr_list.lock);
}

/* link is down - switch connections to alternate link,
--
2.40.1